testmidlet.java

J2ME手机游戏50例

import java.io.IOException;
import java.io.InputStream;

import javax.microedition.lcdui.ChoiceGroup;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

import demo.TestItem;

public class TestMidlet extends MIDlet implements CommandListener{
	private Form form;							//对话框对象
	private ChoiceGroup choice_title;			//存储各个题目的标题
	private StringItem strItem;				//存储结果信息
	private TestItem items[];					//存储所有的题目
	private int curItem = -1;					//当前选择的题目
	private Command OKCommand;                 //测试指令
	private Command ExitCommand;               //退出指令
	private Command BackCommand;				//返回指令
	//type控制对话框的显示内容,
	//0显示所有题目的标题,1显示被选题目的问句及选项,2显示测试结果
	private int type = 0;
	public TestMidlet() {
		super();
		//创建对话框及各个组件
		form = new Form("心理测试");
		choice_title = new ChoiceGroup("选择题目", 
									ChoiceGroup.EXCLUSIVE );
		strItem = new StringItem("","");
		form.append(choice_title);
		
		//读取文本信息
		LoadText();
		//创建高级指令,并将高级指令添加到对话框
		OKCommand = new Command( "测试", Command.OK, 0);
		BackCommand = new Command( "返回", Command.OK, 0);
		ExitCommand = new Command( "退出", Command.EXIT, 0);
		form.addCommand(OKCommand);
		form.addCommand(ExitCommand);
		//设置高级指令监听器
		form.setCommandListener(this);
	}
	private void LoadText(){
		items = new TestItem[100];								//最多允许有100个题目
		try{
			byte b[] = new byte[10240];						//分配10K大小的缓存	
			InputStream is = getClass().getResourceAsStream("/demo/test.txt");
			int total = is.read(b);								//一次性将数据全部读出
			int start = 0;
			int index = 0;
			while( start < total && index < items.length )
			{//当 start < total 时，表明还有尚未读取的题目
				items[index] = new TestItem();					//为新题目分配存储空间
				start = items[index].Load( b, start, total );	//读取一个题目的全部信息
				choice_title.append(items[index].Title, null);	//保存题目的标题
				index ++;
			}
			is.close();
		}
		catch (IOException e){									//输出错误信息
			e.printStackTrace();
		}
	}

	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
	}
	protected void pauseApp() {
	}
	protected void startApp() throws MIDletStateChangeException {
		//将对话框设置为当前屏幕的显示对象
		Display.getDisplay(this).setCurrent(form);
	}
	public void commandAction(Command c, Displayable d) {
		if( c == OKCommand ){
			switch( type ){
			case 0:						//当前对话框上显示所有标题
				curItem = choice_title.getSelectedIndex();
				if( curItem >= 0 ){		//如果选择某个题目,则更换显示内容
					form.deleteAll();
					form.append( items[curItem].choicegroup );
					type = 1;
				}
				break;
			case 1:						//当前对话框上显示问句和选项
				int n = items[curItem].choicegroup.getSelectedIndex();
				if( n >= 0 ){			//如果选择某个选项,则更换显示内容
					form.deleteAll();
					strItem.setText(items[curItem].results[n]);
					form.append( strItem );
					type = 2;
				}
				form.removeCommand(OKCommand);
				form.addCommand(BackCommand);
				break;
			}
		}
		if( c == BackCommand ){
			form.deleteAll();		//则更换显示内容
			form.append( choice_title );
			curItem = choice_title.getSelectedIndex();
			type = 0;
			form.removeCommand(BackCommand);
			form.addCommand(OKCommand);
		}
		if( c == ExitCommand ){
			this.notifyDestroyed();
		}
	}
}